PTS125SM43 Equivalent & Substitute Parts

Part Overview

The PTS125SM43 is a tactile switch manufactured by C&K, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.05A at 12VDC. This through-hole mounted switch features top actuation with a 4.30mm actuator height and standard polybutylene terephthalate (PBT) construction. The product is currently obsolete, with 972 pieces available in original stock. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support and production continuity.

Substiute Parts

PTS125SM43

C&KIn Stock: 997PTS125SM43 Datasheet

Current PartRFQ

PTS125SM43-2 LFS

C&KIn Stock: 41987PTS125SM43-2 LFS Datasheet

DirectRFQ

FSM100

TE Connectivity ALCOSWITCH SwitchesIn Stock: 6813FSM100 Datasheet

DirectRFQ

TL1100DF160Q

E-SwitchIn Stock: 1864TL1100DF160Q Datasheet

DirectRFQ

MJTP1212

APEM Inc.In Stock: 1655MJTP1212 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PTS125SM43 is determined by strict alignment with the following critical parameters:

• Circuit configuration must be SPST-NO
• Contact rating must support 0.05A minimum at operating voltage (12VDC or higher)
• Mounting type must be through-hole with PC pin termination
• Actuator orientation must be top-actuated
• Actuator height must be 4.30mm to ensure PCB clearance compatibility
• Outline dimensions must be 12.00mm x 12.00mm for footprint compatibility
• Operating force tolerance must accommodate 160gf baseline
• Termination style must be PC pin for direct board insertion

Substitute parts are categorized as direct equivalents when all parameters align with the main part specifications, or as similar alternatives when minor parameter variations exist within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

PTS125SM43-2 LFS is the primary direct equivalent substitute. Manufactured by C&K within the same PTS125 series, this part maintains identical mechanical and electrical specifications with the exception of operating force (180gf versus 160gf), which remains within acceptable tactile switch tolerance ranges. The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating, providing superior supply chain availability compared to the obsolete PTS125SM43.

FSM100 manufactured by TE Connectivity ALCOSWITCH Switches is a compatible alternative for applications where higher voltage tolerance (24VDC) is beneficial. This part maintains identical mechanical dimensions, actuator height, and contact current rating. However, mechanical life is reduced to 100,000 cycles, and operating temperature range is narrower (-35°C ~ 85°C). FSM100 is suitable for designs where extended voltage headroom is required.

TL1100DF160Q manufactured by E-Switch provides direct electrical and mechanical compatibility with identical operating force (160gf) and contact rating (0.05A @ 12VDC). This part includes tactile feedback features and maintains the 4.30mm actuator height and 12.00mm x 12.00mm footprint. Mechanical life is 100,000 cycles, and operating temperature range is -20°C ~ 70°C. This part is active with ROHS3 compliance.

MJTP1212 manufactured by APEM Inc. is a similar alternative with flush actuator type rather than standard actuator configuration. All other mechanical and electrical parameters align with the main part specifications, including 160gf operating force, 4.30mm height, and 12.00mm x 12.00mm outline. This part includes tactile feedback and is active with ROHS3 compliance. The flush actuator design may require PCB layout verification for compatibility.

Frequently Asked Questions (FAQ)

Q: Can PTS125SM43-2 LFS be used as a direct replacement for PTS125SM43?

A: Yes. PTS125SM43-2 LFS is a direct equivalent from the same manufacturer and series. The 20gf increase in operating force (180gf versus 160gf) is within standard tactile switch tolerance and does not affect electrical performance or mechanical compatibility. The part is active in production with superior availability.

Q: What is the key difference between FSM100 and the original PTS125SM43?

A: FSM100 is rated for 24VDC contact voltage compared to 12VDC for PTS125SM43. Both parts share identical mechanical dimensions, actuator height, and contact current rating. FSM100 has reduced mechanical life (100,000 cycles versus 200,000 cycles) and a narrower operating temperature range. FSM100 is suitable when higher voltage tolerance is required.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original PTS125SM43 carries RoHS compliance. All parts meet REACH unaffected status and EAR99 export classification.

Q: What is the difference between standard and flush actuator types?

A: MJTP1212 features a flush actuator design, while PTS125SM43, PTS125SM43-2 LFS, FSM100, and TL1100DF160Q use standard actuators. Both types maintain 4.30mm height off PCB and 12.00mm x 12.00mm outline dimensions. Flush actuators may require PCB layout verification to ensure no interference with surrounding components.

Q: Which substitute part has the longest mechanical life?

A: PTS125SM43-2 LFS maintains the original 200,000-cycle mechanical life specification. FSM100, TL1100DF160Q, and MJTP1212 are rated for 100,000 cycles. For applications requiring extended cycle life, PTS125SM43-2 LFS is the recommended choice.

Q: Can these parts be used interchangeably in existing PCB designs?

A: All substitute parts maintain identical through-hole mounting, PC pin termination, 4.30mm actuator height, and 12.00mm x 12.00mm footprint dimensions. Direct PCB footprint compatibility is confirmed. MJTP1212 with flush actuator design may require component placement verification. Electrical compatibility is confirmed for all parts at their respective rated voltages.